Question

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Answer 1

let x=electric guitar practice
let y= acoustic guitar practice

{ x + y = 70
y + 10 = x

Substitute: (y + 10) +y = 70
2y +10 = 70
2y = 60
y = 30
30 + 10 = x
x = 40

Matilda practices acoustic guitar for 30 minutes every day.

She could not practice electric guitar for 50 minutes a day, because that would mean she practices acoustic for 40 minutes a day, and then her total practice time would add up to 90, which is not 70.

Answer 2

Thank you sooo much!!!!