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Interim Checkpoint: Grade 7 Checkpoint 1 - Part 1
Jackie, Maria, and Nadia all live on the same straight road. Jackie marks the location of Maria's home and the location of Nadia's home
on a number line, using her own home's location as 0.
She marks Maria's home at
-10.7
and Nadia's home at 4.9.
What is the distance between Maria's home and Nadia's home on Jackie's number line?
Enter your answer as a decimal in the box.
units
5 6 7 8 9
10 11 12 13 14
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hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system