How do you know whether an equation is an identity?

Will gve pints stars and brainliest

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?