5x + 4y = 24, x + 7y = 11; Prove: y = 1

See explanation

Step-by-step explanation:

5x + 4y = 24 equation i

x + 7y = 11 equation ii

Multiply equation i by 1

Multiply equation ii by 5

5x + 4y = 24 equation iii

5x + 35y = 55 equation iv

Subtract equation iv from iii

-31y = -31

y = 31/31

y = 1

It has been proves that y= 1

Since y = 1

x + 7y = 11

x + 7 = 11

x = 11 - 7

x = 4

just get this app called photo math it should be able to do those

question

given the diagram below, what is md?

the sum of the interior angles is 360°

take away from 360 the sum of the knows angles and you will have the angle d.

360 - 108 - 108 - 72 = 72°