Solve this system of equations using substitution: y = 2x - 4
x + 2y = 10

Step 1: Substitute for y in the second equation. Which is
the resulting equation? x + 2(2x - 4) = 10

Step 2: Which is the next step to solve for x?

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

answer: 7

step-by-step explanation:

if i put something wrong your not gonna like it so rather not say nothing.